Hi
I'am about to change a cosummers unit which is in a very tight space which can not be moved.
The problem is it is within the 150mm of the gas meter/pipework( the electricity service cut out is in the same cupboard (L 580mm X H 580mm X 580mm) and main earthing lead was recentley change by the network supplier with no comment.
My concerns are with (BS 6891:2005 installation of low pressure gas pipework in domestic premises, clause 8.16.2)
Because it is an exsisting old installation can the new consummers unit be fitted in place of the old and if so would I have to make a note on the Electrical Installation Certificate as the none compliance with BS6891:2005

Have been asked the same question by a plumber recently...
Consider also;

BS 6891:2005(2008)
"COMMENTARY AND RECOMMENDATIONS ON 8.16.1
The application of electrical insulating tapes should provide adequate protection where spacing is
impracticable."

I would consider
"Separation of at least 25mm to be provided for domestic pipework upto 35mm. For pipework over 35mm then 50mm separation is required"
To be Essential, and I would do everything reasonably practicable to ensure this is complied with.

If 150mm Separation between the gas meter and CCU is impossible to achieve i would note as a departure on the EIC

Aggree with spikey,
Last time i found this, i could not find exact refrence in regs book, however in guidance notes, and if i recall building regs , it said to install barrier between the two, ie pink plasterboard.

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Yes i do do 24/7 everyday of the FLAMIN year.